Not an air raid...no sound of jets...not a missle/smart bomb as they tend to make noise at sub-sonic and would otherwise create a boom coming in, the sound quality on these is actually pretty good, I could be wrong, but...I think something took place at ground level, something started a fire or small explosion inside that cooked off small stuff and ignited something really nasty...cannot rule out a mistake by terrorists or sabotage...frankly...if as I suspect it is a terrorist cache...good riddance to it, it probably saved untold innocent lives and took a few bad guys out in the process...if innocent collateral damage, well that'd be on the bad guys for piling that much explosives in a densely populated area.